Myotonic dystrophy type 2: This form typically begins in adulthood.Childhood myotonic dystrophy type 1: This form usually begins around the age of 10.Congenital myotonic dystrophy type 1: This form affects infants (“congenital” means “present at birth”).Mild myotonic dystrophy type 1: This form affects people 20 to 70 years old (typically after the age of 40).Classic myotonic dystrophy type 1: This form usually begins in your 20s, 30s or 40s.(But certain types of myotonic dystrophy begin in infancy or childhood.) Who does myotonic dystrophy affect?ĭifferent forms of myotonic dystrophy begin at different ages: It’s the most common form of muscular dystrophy that begins in adulthood. Myotonic dystrophy is one type of muscular dystrophy. This affects your ability to walk and perform daily activities. Over time, your muscles shrink and become weaker. These conditions are a type of myopathy, a disease of your skeletal muscles. Muscular dystrophy refers to a group of more than 30 inherited (genetic) conditions that cause muscle weakness. What is the difference between muscular dystrophy and myotonic dystrophy? Their symptoms overlap, but DM2 tends to be milder than DM1. Myotonic dystrophy type 2 (DM2), also known as proximal myotonic myopathy.DM1 has four types: classic, mild, congenital and childhood. Myotonic dystrophy type 1 (DM1), also known as Steinert disease.There are two main forms of myotonic dystrophy: It can affect several body systems, including your: Myotonic dystrophy (DM) has a wide range of symptoms. People with the condition often have prolonged muscle contractions ( myotonia) and can’t relax certain muscles after using them. Myotonic dystrophy (DM) is a complex, inherited condition that mainly causes progressive muscle atrophy and weakness.
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